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Help! Computer behaving wierd\unable to install new software.

Hi. I think I may have a Virus on my computer or some corrupted files. It is behavingly very sluggishly and has started logging me in to a temporary profile, my desktop is different, even though I still sign in to my administrator account at startup. In addition to this, whenever I try to install new software, at the end of the installation I am greeted with an error 1450 saying it couldn't write to a registry "insuficient system resources exist).

I ran malwarebytes with a full scan and it did pick up around 70 objects and PUP's which i removed. But it is still logging me in on the temporary profile, and not allowing installs.

I have followed the instructions.. I had already tried that and everytime I rename the profile in Regedit by removing the .bak and changing the other one, it still logs me into a temp profile... I then followed the further instructions. I tried to run a chkdsk and sfc from command prompt at startup but it wouldnt let me.. When i tried sfc it said "Cannot run because a repair is scheduled, restart first" and then when I tried to run Chkdsk it said cannot run because "volume is locked" or something.

I then followed the further instructions to delete the profile to make a new one. I deleted it and followed the instructions and now it still just logs me into the temp profile and now my main profile is gone.

Its stressing me out so much I decided to just reinstall windows, but due to the problem, I cant effing install the windows USB tool to make a copy of my OS. Also cant download an ISO of windows 7 from the microsoft site because my version came "preinstalled on my machine" so that apparently makes me not allowed to download it.